Other

Rhodia Chimie

Rhodia Operations

Bernard Vogin

Jean-Marie Bernard

Pierre Marcel Ardaud

Francis John Williams

Kamel Ramdani

Nathalie Guennouni

Nathalie Guennount

The invention relates to the preparation of organodialkylalkoxysilane using a continuous method consisting in bringing an alkanol into continuous contact with an omega-haloalkyl dialkylhalosilane in a countercurrent reactor, such as a plate column or a packed column. The reaction is performed in the aforementioned countercurrent reactor in the presence or absence of a non-reactive solvent with scavenging of the hydrochloric acid formed. The omega-haloalkyl dialkylalkoxysilane thus formed is particularly suitable for use as a starting material for the preparation of organosilicon compounds containing sulphur having general formula (I) by means of sulphidisation reaction on an alkaline metal polysulphide.

Method of preparing organo dialkylalkoxysilane

The invention concerns an isocyanate composition useful for applying powder paints. Said composition is characterized in that it contains a masked isocyanate compound and an unmasked cycloaliphatic isocyanate compound. The invention is applicable in the chemistry of paints.

Isocynate composition comprising a masked isocyanate and a nonmasked and their use in a coating

Provided is a composition useful for obtaining a high gloss coating, for example, a high gloss paint. The composition includes an isocyanate which is at least partially masked by one or more masking agent, and having a degree of liberation with respect to the masking agent at 120 &deg; C. of 5 % or less. A polyol has a glass transition temperature of about 40&deg; C. or more, a hydroxyl number of about 20 mg KOH/g or more and an average molecular weight Mn of about 500 g/mol or more. Also provided is a process for preparing the composition, wherein the isocyanate, the polyol and any other components are preblended in a blender. The polyol and other meltable components of the blend are melted, homogenized and dispersed in an extruder having one or more screws. Further provided are paint compositions, wherein the paint is a high gloss paint. The compositions are environmentally friendly and result in high gloss coatings having beneficial mechanical properties.

Compositions useful for obtaining high gloss coatings, methods of using such compositions and coatings thus obtained

Composition which is useful for obtaining a matt or satin coating, use of this composition and coating thus obtained

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Chaponost, France

Bernard Vogin